在ObjC中獲得NSDate秒數

Question

秒數爲54000. 如何獲得時間爲3:00:00 PM？

任何dateformatter的我可以用它來得到它？

感謝

Answer 1

假設GIVEN秒都在本地時區，你想轉換爲本地時區。

NSInteger timeInSeconds = 54000; 

NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:timeInSeconds]]; 

NSDateFormatter *formatter = [[NSDateFormatter alloc]init]; 
[formatter setDateFormat:@"hh:mm:ss a"]; 

NSString *dateString = [formatter stringFromDate:date]; 

Answer 2

假設你要根據上一個「正常」的日子當前區域設置格式化的時間（即一個無時區變化），

double seconds = 54000; 

NSDateFormatter * fmt = [NSDateFormatter new]; 
[dateFormatter setDateStyle:NSDateFormatterNoStyle]; 
[dateFormatter setTimeStyle:NSDateFormatterLongStyle]; 
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]]; 

NSDate *date = [NSDate dateWithTimeIntervalSinceReferenceDate:seconds]; 
NSString * s = [fmt stringFromDate:date]; 

// If you are not using ARC, 
[fmt release];